# CVE-2025-53643: python-aiohttp: request smuggling vulnerability due to incorrect parsing trailer sections of an HTTP request

CVE-2025-53643 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2025-53643, released July 14, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-53643
- Priority: High
- CVSS: 7.5 (IMPORTANT)
- EPSS: 0.0036
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 14, 2025

## Description

request smuggling vulnerability due to incorrect parsing trailer sections of an HTTP request

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-Brotli opensuse-leap 16.0 | 1.1.0-160000.3.1 | [OPENSUSE-SU-2026:20204-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20204-1.md) | Feb 12, 2026 |
| Linux | python-Brotli sles 16.0 | 1.1.0-160000.3.1 | [SUSE-SU-2026:20425-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20425-1.md) | Feb 12, 2026 |
| Linux | python-aiohttp Debian 12.15 (bookworm) | 3.8.4-1+deb12u2 | [DEBIAN-CVE-2025-53643](https://patchblox.com/security/data/fix/linux/debian-cve-2025-53643.md) | Jul 14, 2025 |
| Linux | python-aiohttp Debian 14 | 3.12.15-1 | [DEBIAN-CVE-2025-53643](https://patchblox.com/security/data/fix/linux/debian-cve-2025-53643.md) | Jul 14, 2025 |
| Linux | python-aiohttp opensuse-leap 15.6 | 3.9.3-150400.10.33.1 | [SUSE-SU-2025:03057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03057-1.md) | Sep 3, 2025 |
| Linux | python-aiohttp opensuse-leap 16.0 | 3.11.16-160000.3.1 | [OPENSUSE-SU-2026:20204-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20204-1.md) | Feb 12, 2026 |
| Linux | python-aiohttp sles 15.6 | 3.6.0-150100.3.27.1 | [SUSE-SU-2025:03201-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03201-1.md) | Sep 12, 2025 |
| Linux | python-aiohttp sles 15.7 | 3.6.0-150100.3.27.1 | [SUSE-SU-2025:03201-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03201-1.md) | Sep 12, 2025 |
| Linux | python-aiohttp sles 16.0 | 3.11.16-160000.3.1 | [SUSE-SU-2026:20425-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20425-1.md) | Feb 12, 2026 |
| Linux | python39-oci-sdk ol 9 | 0:2.187.0-1.0.5.el9 | [ELSA-2026-604898](https://patchblox.com/security/data/fix/linux/elsa-2026-604898.md) | Nov 7, 2026 |
| Linux | python39-oci-sdk-docs ol 9 | 0:2.187.0-1.0.5.el9 | [ELSA-2026-604898](https://patchblox.com/security/data/fix/linux/elsa-2026-604898.md) | Nov 7, 2026 |

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Data as of 2026-11-11T07:45:43Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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